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How to disable incompatible discrete GPUs

There are two main methods for disabling incompatible external GPUs.

Method 1: via Config

The easiest way to disable an incompatible discrete GPU is via your config.plist. You can use either DeviceProperties or a boot argument to do so (both require WhateverGreen.kext). ⚠️ This method only works on CPUs with integrated graphics since the device property/boot-arg instructs the iGPU to disable the dGPU. Otherwise, you need to disable it via ACPI (Method 2).

  • Option 1: using DeviceProperties.
    • Open your config.plist
    • Go to DeviceProperties/Add/PciRoot(0x0)/Pci(0x2,0x0)
    • Add Key disable-gpu: Value: 01000000, Class: DATAto your GPU's PCI Address to disable it:
      DisableGPU
    • Add WhateverGreen.kext (if not present already)
  • Option 2: using boot-arg
    • In NVRAM/Add/7C436110-AB2A-4BBB-A880-FE41995C9F82
    • Add-wegnoegpu to boot-args (disables all external GPUs!)
    • Add WhateverGreen.kext (if not present already)
  • Option 3: Multiple GPUs
    • In case you are using more than one GPU but only one of them is compatible with macOS, disable the incompatible GPU via SSDT (→ see Method 2), don't use the boot-arg!

Method 2: with SSDT Hotpatches

Patch principle

  • Disables the dGPU during initialization phase.
  • Enables dGPU during sleep to prevent the system from crashing when it enters S3 powerstate.
  • Disables dGPU again after the machine wakes up.

Patch Requirements

  • SSDT-PTSWAK
  • GPU blocking patch: either SSDT-NDGP_OFF or SSDT-NDGP_PS3

Instructions

  • Add SSDT-PTSWAK. See Comprehensive Sleep and Wake Patch for details
  • Add eiher/or:
    • SSDT-NDGP_OFF
      • In DSDT, find the name and path of DGPU and confirm the existence of the _ON and _OFF methods.
      • Refer to the example and change the name and path to match the device name and patch used in the DSDT.
    • SSDT-NDGP_PS3
      • Find the name and path of DGPU and confirm the existence of _PS0, _PS3 and _DSM methods
      • Refer to the example and change the name and path to match the query result.

Note: if this doesn't work either, you can try your luck with Rehabman's SSDT-DGPU (See instructions inside the .dsl file)

Disabling discrete Laptop GPUs

→ Follow this guide by Dortania.

Notes and Resources

  • For Method 2, SSDT-PTSWAK and SSDT-NDGP_OFF [or SSDT-NDGP_PS3] must be combined to make the whole construct work.
  • If both SSDT-NDGP_OFF and SSDT-NDGP_PS3 meet the requirements, SSDT-NDGP_OFF is preferred.
  • The name and path of the GPU in the example is: _SB.PCI0.RP13.PXSX. Correct the name and path according to the name used in your ACPI tables if necessary.
  • The SSDT method was developed by RehabMan